M&S says

This white single housewife pillowcase is fantastic for those stuffy nights when the heat disturbs your sleep, giving you something cool and comfy to rest you’re head on. This sustainably made pillowcase uses a Tencel® rich blend, which is drawn from the eucalyptus tree, and actively helps to moderate your body temperature and draw moisture off your skin. The fine and smooth fibres of Tencel® makes this material feel luxurious against your skin, as you drift off into a long, unbroken sleep.

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35 days to return - You may return or exchange unused products within 35 days of purchase with a valid parcel summary document. Your items don't need to be in the original box or bag as long as they're securely packaged.How to return
1. FREE returns to select M&S stores
2. Easy returns from home. Simply print the returns label, attach it to the top of your parcel and insert the returns note in the parcel. We will automatically deduct the cost of return from your refund.
To print the returns label and return, simply click here.Tell me more about how to return items and the returns policy

* 20% off all Homeware: 20% off on all Homeware products.Offer commences from 14.05.2018 and ends 29.05.2018 online at marksandspencer.com/ae only. Discount will be shown at checkout. Offer excludes sale items and other full basket discounts. Please check relevant delivery terms & conditions online. Offer does not apply to delivery charges. Subject to availability. Refunds will take into consideration the discount. M&S reserves the right to reject this offer with reasonable cause